Furnace Flue Pipe Clearances?

[atv_freak]

Not sure this is allowed since this isn't about my garage... but any advice would be much appreciated!

I've tried reading up on georgia hvac codes, but I can't make heads or tails of them.

I'm trying to figure out if I can condense a 4ftx2ft space that goes from the basement up to the attic and it contains hvac/exhaust stuff. It takes up valuable space in both the kitchen and the second floor master bathroom. I've attached a rough sketch of what is inside the wall and approximate space between everything.

I would imagine there are codes on how much clearance has to be around the flue pipe? Can the exhaust be routed out the side of the house and not the roof if it isn't a high efficiency furnace/hot water heater?

It just seems like there is a whole lot of wasted space that I would much rather use in the kitchen!

Thanks!

 

[zmaxmotorsports]

With B-vent pipe 1" clearance is normally required,around here any way.
No you cant vent an 80% furnace straight out a wall like a 90plus/power vented style furnace.

 

[Mike007]

The gas furnace can be directly vented out a sidewall IF the rating plate indicates it is Category I and III rated. Some 80% furnaces have this rating. You would need to use a Category III vent system. It would most likely be stainless and not cheap.

 

[atv_freak]

Thanks for the info! Are the flexible insulated air ducts considered flammable?

 

[theoldwizard1]

A local inspector made the furnace company do so minor mods after they installed my new furnace because a 1" clearance was required from the outer circumference of the double wall vent pipe and any combustible surface, including the paper on sheet rock.

 

[atv_freak]

Cool, that means I have some options on shrinking that space then! Thanks for the help!

 

[D.J.]

I would think your make and model number of your furnace would be needed by the hvac gurus for a good answer.

 

[atv_freak]

The furnace is a Lennox 80mfg4-75a-7 and the hot water heater is a Rheem 21v40s-8.

 

[atv_freak]

I found the a unit information brochure for the furnace and under optional accessories there is a sidewall power venting kit (79J15) listed. I'm assuming this means it can be vented out the wall?

 

[Mike007]

I found the a unit information brochure for the furnace and under optional accessories there is a sidewall power venting kit (79J15) listed. I'm assuming this means it can be vented out the wall?

Ive already answered your question. If it is approved for sidewall venting it will show category III rated on the info. plate.

 

[Mike007]

Ive already answered your question. If it is approved for sidewall venting it will show category III rated on the info. plate.

And FYI, if it's not category III rated it can still be sidewall vented properly with a power sidewall venter kit.

 

[atv_freak]

Sorry Mike, I forgot to check for that when I had the panel open. Can the power vent kits be used with both the furnace and the hot water heater? Or is the water heater a whole other animal? I appreciate the help!

 

[Mike007]

Sorry Mike, I forgot to check for that when I had the panel open. Can the power vent kits be used with both the furnace and the hot water heater? Or is the water heater a whole other animal? I appreciate the help!

Yes, the water heater would be a whole other issue. Assuming it has a pilot light, the draft inducer would have to be running 24/7. You could always change the water heater for a type that is direct vent.

 

[Jackfre]

I believe that you will find it easier to use the Tjernlund Products power venters for the furnace and water heater. Field works as well, but I think Tjernlunds controls are better.